Question

the length of a rectangle is four times its width. if the area is 100 m2 what is the length of the rectangle?

Answer 1

width=x
lenght = 4x
area=l×b
100=4x × x
100=4x square
100÷4= x square
25=x square
$\sqrt{5 } = {x }^{2}$
5=x

Answer 2

Answer:

The area of the rectangle = length × breadth

Letting the width = x m

Then, length = 4x m

A = l × b = 100 m²

4x × x = 100 m²

x² = 100/4 m²; then removing the squares

x = 10/2 m

x = 5 m = width

Length = 20 m